根据所给提示，完成短文
Studies have shown that injuries and deaths caused by earthquakes over the last several decades are most often caused by falling or flying objects. Unlike other types of natural disasters, earthquakes can happen at any time, without any notice.(在面对地震时)，what should you do to protect yourself?
The best way to shelter in place is to drop, cover and hold on. First, wherever you are, drop onto your hands and knees. This position helps (使你免于被撞倒)，and allows you to crawl(爬)to shelter. Second, with one arm and hand, cover your head and neck. Third, If you're under shelter, hold onto it with one hand. If there's no shelter, hold on to your head and neck with both arms and hands. In addition, (远离)buildings, trees and power lines. In most situations, you will reduce your chance of injury if you (采取这些措施)一"drop,cover,hold on".
Keep these three steps in mind. When an earthquake occurs, keep calm and (尽最大的努力保护你们自己).